/**
 * Copyright (C) 2007, 2008 Carnegie Mellon University and others.
 *
 * This file is part of Plural.
 *
 * Plural is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Plural is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Plural; if not, see <http://www.gnu.org/licenses>.
 *
 * Linking Plural statically or dynamically with other modules is
 * making a combined work based on Plural. Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * In addition, as a special exception, the copyright holders of Plural
 * give you permission to combine Plural with free software programs or
 * libraries that are released under the GNU LGPL and with code
 * included in the standard release of Eclipse under the Eclipse Public
 * License (or modified versions of such code, with unchanged license).
 * You may copy and distribute such a system following the terms of the
 * GNU GPL for Plural and the licenses of the other code concerned.
 *
 * Note that people who make modified versions of Plural are not
 * obligated to grant this special exception for their modified
 * versions; it is their choice whether to do so. The GNU General
 * Public License gives permission to release a modified version
 * without this exception; this exception also makes it possible to
 * release a modified version which carries forward this exception.
 */

package edu.cmu.cs.nimby.test.simple.client;
import java.io.FileWriter;
import java.io.IOException;

import edu.cmu.cs.crystal.annotations.PassingTest;
import edu.cmu.cs.crystal.annotations.UseAnalyses;
import edu.cmu.cs.plural.annot.ClassStates;
import edu.cmu.cs.plural.annot.Perm;
import edu.cmu.cs.plural.annot.Share;
import edu.cmu.cs.plural.annot.State;
import edu.cmu.cs.plural.annot.Use;


/**
 * This test makes sure that source variable declarations, notably
 * those of parameters, do not cause me to forget the state of
 * other variables, since they are not expressions.
 */
@PassingTest
@UseAnalyses("NIMBYChecker")
@ClassStates({@State(name="alive", inv="full(socket)"),
              @State(name="IDLE", inv="socket == null"),
              @State(name="CONNECTED", inv="socket != null")})
public class SourceVariablesOkay {
	
	private BufferedWriter socket;
	
	@Share(use = Use.FIELDS, requires="CONNECTED", ensures="CONNECTED")
	void send(String txt) throws IOException {
		atomic: {
			this.socket.write(txt + "\n");
			return;
		}
	}
}

class BufferedWriter extends java.io.BufferedWriter {
	@Perm(ensures="unique(this!fr)")
	public BufferedWriter(FileWriter f) {
		super(f);
	}
}